M38B78FDFP View Datasheet(PDF) - MITSUBISHI ELECTRIC

Part Name

Description

Manufacturer

M38B78FDFP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

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[CPU Mode Register (CPUM)] 003B16

The CPU mode register contains the stack page selection bit and

the internal system clock selection bit etc.

The CPU mode register is allocated at address 003B16.

MITSUBISHI MICROCOMPUTERS

38B7 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

b7

Fig. 7 Structure of CPU mode register

b0

CPU mode register

(CPUM: address 003B16)

Processor mode bits

b1b0

0 0 : Single-chip mode

0 1:

1 0 : Not available

1 1:

Stack page selection bit

0 : Page 0

1 : Page 1

Not used (return “1” when read)

(Do not write “0” to this bit.)

Port XC switch bit

0 : I/O port function

1 : XCIN–XCOUT oscillating function

Main clock (XIN–XOUT) stop bit

0 : Oscillating

1 : Stopped

Main clock division ratio selection bit

0 : f(XIN) (high-speed mode)

1 : f(XIN)/4 (middle-speed mode)

Internal system clock selection bit

0 : XIN-XOUT selection (middle-/high-speed mode)

1 : XCIN-XCOUT selection (low-speed mode)

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